期刊
ACS MACRO LETTERS
卷 5, 期 3, 页码 268-272出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.5b00887
关键词
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资金
- AFOSR MURI program [FA9550-12-1-0002]
- ConvEne IGERT Program of the National Science Foundation [NSF-DGE 0801627]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
We demonstrate how processing methods affect the thermoelectric properties of thin films of a high mobility semiconducting polymer, PBTTT. Two doping methods were compared: vapor deposition of (tridecafluoro-1,1,2,2-tetrahydrooctyl)trichlorosilane (FTS) or immersion in a solvent containing 4-ethylbenzenesulfonic acid (EBSA). Thermally annealed, thin films doped by FTS deposited from vapor yield a high Seebeck coefficient (a) at high electronic conductivity (alpha) and, in turn, a large power factor (PF = alpha(2)sigma) of similar to 100 mu W m(-1) K-2. The FTS-doped films yield alpha values that are a factor of 2 higher than the EBSA-doped films at comparable high value of sigma. A detailed analysis of X-ray scattering experiments indicates that perturbations in the local structure from either dopant are not significant enough to account for the difference in a. Therefore, we postulate that an increase in a arises from the entropic vibrational component of a or changes in scattering of carriers in disordered regions in the film.
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